[pulseaudio-discuss] use 7.1 audio chip as 2x stereo?

[Maarten Bosmans]

You have to manually edit the default startup script for Pulseaudio.
In Ubuntu this is the file /etc/pulse/default/pa.
Use module-remap-sink
(http://pulseaudio.org/wiki/Modules#module-remap-sink) like this:

load-module module-remap-sink master=sinkname channels=2
channel_map=left,right master_channel_map=rear-left,rear-right


As an example this is my setup:
load-module module-alsa-sink tsched=0 sink_name=alsa_master
device=hw:0 rate=48000 channels=6
channel_map=aux0,aux1,aux2,aux3,aux4,aux5
load-module module-remap-sink sink_name=computer master=alsa_master
channels=2 channel_map=left,right master_channel_map=aux0,aux1
load-module module-remap-sink sink_name=room1 master=alsa_master
channels=1 channel_map=mono master_channel_map=aux4
load-module module-remap-sink sink_name=room2 master=alsa_master
channels=1 channel_map=mono master_channel_map=aux5
load-module module-combine sink_name=everything slaves=computer,room1,room2
update-sink-proplist computer device.description="Computer output"
update-sink-proplist room1 device.description="Living room"
update-sink-proplist room2 device.description="Kitchen"
update-sink-proplist everything device.description="The whole house"
set-default-sink copmuter

The update-sink-proplist commands are only available in what's going
to bet Pulseaudio 0.9.15.
I set up pulse as a system daemon
(http://pulseaudio.org/wiki/SystemWideInstance), which might also be
good
for your purpose. To do this in Ubuntu, flip the switch in
/etc/default/pulseaudio and alter the commands in the
file /etc/pulse/system.pa.

Maarten